Syringe.



Patented Sept. 7, 1909.

F. A. STAHL.

SYRINGB.

APPLICATION FILED 00T. 2s, 190s.

FREDERICK A. STAHL, OF NEW YORK, N. Y.

SYRINGE.

Specification of Letters Patent.

Patented Sept. *7, 1909.

Application led October 23, 1908. Serial No. 459,114.

To all whom fit may concern:

Be it known that I, FREDERICK A. STAI-1L, a citizen of the UnitedStates, residing at New York city, in the county of New York and Stateof New York, have invented certain new and useful Improvements inSyringes, of which the following is a specilication.

My invention relates to syringes and particularly to a piston head andvalve for a syringe having a tubular piston rod provided with an inletat its upper end to receive a liquid and an outlet at the lower end todischarge the liquid into the piston barrel, from which it is dischargedthrough the combined inlet and outlet thereof.

It has for its object to provide a piston head and valve for a syringeof this character adapting it to also receive a liquid directly into itsbarrel and discharge it therefrom through the combined inlet and outletthereof, and means adapting its piston rod to slide easily andpreventing it from swelling.

In the drawings: Figure 1 is a side View of the syringe. Fig. 2 alongitudinal, vertical, sectional view thereof. Fig. 3 a fragmentaryvertical sectional view, on an enlarged scale, of the piston rod andpiston head and valve thereon. Fig. 4 an edge view, on an enlarged scaleof the piston head and valve of the piston rod, and Fig. 5 a centralvertical sectional view, on the same scale as Fig. 4, of the piston headand valve of the piston rod.

In all the flgures of the drawings illustrating my invention, likereference characters designate corresponding parts.

Referring to the drawings, 1 designates the tubular piston rod barrel,which is open at its upper end and provided at its lower end with areduced portion forming a neck 2 and having a combined inlet and outlet3 communicating with the interior of the piston rod barrel and a flange4. A nozzle 5, of rubber or other elastic material, is removably securedon the lower end of the piston rod barrel, said nozzle having acentrally located circular cavity 6 receiving the flange 4, a centrallylocated circular hole 7, of less diameter than the cavity 6,communicating therewith from the top of the nozzle and receiving theneck 2, and a centrally located combined inlet and outlet 8communicating with the cavity 6 from the bottom of the nozzle. A stopper9 is removably located in the combined inlet and outlet 8 of the nozzleand provides means for controlling it and also controlling the combinedinlet and outlet 3 of the piston rod barrel. The tubular piston rod 1()is reciprocally located in the piston rod barrel, the upper end of saidpiston rod being open and extending out of the upper end of the pistonrod barrel, thereby affording an opportunity for grasping it between thefingers and a cap 11 having an air hole, is screwed thereon and thelower end of said piston rod is provided with a reduced portion forminga neck 12 and having an outlet 13 and a flange 14. A piston head 15, ofrubber or other elastic material is removably secured on the lower endof the piston rod, said piston head having a centrally located circularcavity 16, receiving the flange 14, and a centrally located hole 17intersecting the cavity 16 from the top of the piston head, the upperport-ion of said hole receiving the neck 12 and the lower portionthereof registering with the outlet 13 and being controlled by anintegral flap valve 18 normally closing it, said valve being formed byslitting the piston head so as to intersect the lower portion of thehole 17.

rIhe working surface of the piston head is covered with cloth 20 orother suitable nonelastic material, providing a smooth surface beemployed for forming the piston heathand then inserting the rubber intothe mold in a partially compressed state and fully compressing it, thuspractically making the cloth an integral part of the piston head.

For sanitary reasons, the piston rod and its-barrel are preferably madeof glass, but may be made of hard rubber or any other suitable materialdesired. p

The operation is as follows: The parts of the syringe being in theposition shown by Fig. 1 of the drawings, the cap 11 of the piston rodis removed and after liquid has been poured into the piston rod the capis replaced, the piston rod is pulled upwardly and the suction createdthereby in the lower end of the piston rod barrel opens the valve 18allowing liquid to pass from said piston rod into the piston rod barrel,the amount of liquid passing into the piston rod barrel depending uponthe distance the piston rod is drawn upwardly, the stopper 9 is thenremoved and the piston rod pressed downwardly, which has the eliect ofclosing the valve 18 and forcing the liquid out of the piston rodbarrel.

Assuming the part-s of the syringe to be in the position shown by Fig. 1of the drawings, if it is desired to draw liquid directly into anddischarge it from the piston rod barrel, the stopper 9 is removed andthe nozzle is inserted into liquid, the piston rod is then pulledupwardly and the suction created thereby in the lower end of the pistonrod barrel 1 draws liquid therein, and to discharge the liquid thepiston rod is pushed down again.

I do not wish to be understood as limiting myself to the precise detailsand arrangement of parts shown and described, but reserve the right toall modifications within the scope of my invention.

I/Vhat I claim is:

1. The combination with a syringe having a tubular barrel open at oneend and provided with a combined inlet and outlet at the other end and atubular piston rod in said barrel provided with an inlet at one end andan outlet at the other end, of a piston head of elastic material on theoutlet endv` of said piston rod bearing against the pistonv rod barreland serving as a packing, said piston head being provided with a valvecontrolling the outlet of the piston rod, substantially as described.

2. The combination of a syringe having a tubular barrel open at one endand provided with a combined inletv and outlet at the other end and atubular piston rod in said barrel provided with an inlet at one end andan outlet at the other end, of a head of elastic material on the outletend of said piston rod having a valve integral therewith controllingsaid piston rod outlet, substantially as described.

3. A piston head of elastic material for hollow piston rods of barrelsyringes adapted to be placed over and surround the outlet end of thepiston rod and bear against the piston rod barrel and serve as apacking, said piston head being provided with a valve controlling theoutlet of the piston rod, substantially as described.

4. A piston head of elastic material, for hollow piston rods ofsyringes, adapted to be placed over the piston rod outlet and having avalve integral therewith controlling said piston rod outlet,substantially as described.

5. The combination with a syringe having a tubular barrel open at oneend and provided with a combined inlet and outlet at theother end, astopper for said combined inlet and outlet, and a tubular piston rod insaid barrel provided with an inlet at one end and an outlet at the otherend, of a piston head of elastic material on the outlet end of saidpiston rod having a valve integral therewith controlling said piston rodloutlet, substantially as described.

lIn testimony whereof I have signed my name m the presence of twosubscribing Wltnesses.

FREDERICK A. STAHL.

Witnesses:

GRAHAM B. MOORE, MARION A. RAFTERY.

